<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="UTF-8">
    <meta name="author" content="wangbo">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        body {
            background-color: #101010;
        }
    </style>
</head>

<body>
    <script>
        //鼠标移动事件（document范围内移动）
        document.onmousemove = function (event) {
            //1、创建div
            var _div = document.createElement("div");
            //生成随机的宽高
            var random = Math.floor(Math.random() * 30) + 10;
            _div.style.width = random + "px";//节点宽度
            _div.style.height = random + "px";//节点高度
            _div.style.borderRadius = "50%";//圆形
            _div.style.backgroundColor = randomColor();//随机背景色
            //2、定位div
            _div.style.position = "absolute";
            _div.style.left = (event.clientX - random / 2) + "px";//左边距
            _div.style.top = (event.clientY - random / 2) + "px";//右边距
            //3、追加div
            document.body.appendChild(_div);
            //4、延迟删除div
            setTimeout(function () {
                _div.remove();
            }, 500)
        }
        //生成随机颜色
        function randomColor() {
            var random1 = Math.floor(Math.random() * 256);
            var random2 = Math.floor(Math.random() * 256);
            var random3 = Math.floor(Math.random() * 256);
            return `rgb(${random1},${random2},${random3})`;
        }
    </script>

</body>

</html>